Multi-LO band switched-core frequency mixer

Abstract

A frequency mixer is disclosed. In an implementation, the multi-LO band switched-core includes a single field-effect transistor (FET) ring having a first mixer core and a second mixer core. The first mixer core and the second mixer core configured to connect to a radio frequency (RF) port and an intermediate frequency (IF) port. The frequency mixer also includes a first local oscillator (LO) transformer and a second LO transformer. The first LO transformer is configured to furnish a first LO signal occurring in a first limited range of frequencies to the first mixer core, and the second LO transformer is configured to furnish a second LO signal occurring in a second limited range of frequencies to the second mixer core.

What is claimed is: 
     
       1. A frequency mixer comprising:
 a single field-effect transistor (FET) ring comprising a first mixer core and a second mixer core, the first mixer core and the second mixer core configured to connect to a radio frequency (RF) port and an intermediate frequency (IF) port; 
 a first local oscillator (LO) transformer connected to the single FET ring, the first LO transformer configured to furnish a first LO signal occurring in a first limited range of frequencies to the first mixer core; 
 a second LO transformer connected to the single FET ring, the second LO transformer configured to furnish a second LO signal occurring in a second limited range of frequencies to the second mixer core, the first limited range of frequencies different than the second limited range of frequencies, the single FET ring including a plurality of segments, each one of the plurality of segments including at least a first transistor and a second transistor, the first transistor defining the first mixer core and the second transistor defining the second mixer core; 
 a first LO path for transmitting the first LO signal during a first time interval; 
 a second LO path for transmitting the second LO signal during a second time interval, wherein the first transistor is connected to a first LO path and the second transistor is connected to a second LO path; and 
 LO select circuitry for selectively activating the first LO path during the first time interval and selectively activating the second LO path during the second time interval, 
 wherein the first LO signal is configured to cause the first mixer core to commutate a frequency mixer signal during the first time interval and the second LO signal is configured to cause the second mixer core to commutate the frequency mixer signal during the second time interval, the second time interval different than the first time interval. 
 
     
     
       2. The frequency mixer as recited in  claim 1 , wherein the second mixer core is configured to at least substantially pass-thru the signal during the first time interval and the first mixer core is configured to at least substantially pass-thru the signal during the second time interval. 
     
     
       3. The frequency mixer as recited in  claim 1 , wherein at least one of the first transistor or the second transistor comprise a metal-oxide-semiconductor field-effect transistor (MOSFET) device. 
     
     
       4. The frequency mixer as recited in  claim 3 , wherein at least one of the first transistor and the second transistor comprise an n-type MOSFET device. 
     
     
       5. The frequency mixer as recited in  claim 1 , further comprising a first driver coupled to the first LO transformer, the first driver configured to amplify the first LO signal during the first time interval; and a second driver coupled to the second LO transformer, the second driver configured to amplify the second LO signal during the second time interval. 
     
     
       6. A frequency mixer comprising:
 a field-effect transistor (FET) ring comprising a first mixer core and a second mixer core, the first mixer core and the second mixer core configured to connect to a radio frequency (RF) port and an intermediate frequency (IF) port; 
 a first local oscillator (LO) transformer connected to the FET ring, the first LO transformer configured to furnish a first LO signal occurring in a first limited range of frequencies to the first mixer core; 
 a second LO transformer connected to the FET ring, the second LO transformer configured to furnish a second LO signal occurring in a second limited range of frequencies to the second mixer core, the first limited range of frequencies different than the second limited range of frequencies, the FET ring including a plurality of segments, each one of the plurality of segments including at least a first transistor and a second transistor, the first transistor defining the first mixer core and the second transistor defining the second mixer core; 
 a first LO path for transmitting the first LO signal during a first time interval; 
 a second LO path for transmitting the second LO signal during a second time interval, wherein the first transistor is connected to a first LO path and the second transistor is connected to a second LO path; and 
 LO select circuitry for selectively activating the first LO path during the first time interval and selectively activating the second LO path during the second time interval, 
 wherein the first LO signal is configured to cause the first mixer core to commutate a frequency mixer signal during the first time interval and the second LO signal is configured to cause the second mixer core to commutate the frequency mixer signal during the second time interval. 
 
     
     
       7. The frequency mixer as recited in  claim 6 , wherein the second mixer core is configured to at least substantially pass-thru the signal during the first time interval and the first mixer core is configured to at least substantially pass-thru the signal during the second time interval. 
     
     
       8. The frequency mixer as recited in  claim 7 , wherein at least one of the first transistor or the second transistor comprise a metal-oxide-semiconductor field-effect transistor (MOSFET) device. 
     
     
       9. The frequency mixer as recited in  claim 8 , wherein at least one of the first transistor and the second transistor comprise an n-type MOSFET device. 
     
     
       10. The frequency mixer as recited in  claim 6 , further comprising a first driver coupled to the first LO transformer, the first driver configured to amplify the first LO signal during the first time interval; and a second driver coupled to the second LO transformer, the second driver configured to amplify the second LO signal during the second time interval. 
     
     
       11. A frequency mixer comprising:
 a field-effect transistor (FET) ring comprising a first mixer core and a second mixer core, the first mixer core and the second mixer core configured to connect to a radio frequency (RF) port and an intermediate frequency (IF) port; 
 a first local oscillator (LO) transformer connected to the FET ring, the first LO transformer configured to furnish a first LO signal occurring in a first limited range of frequencies to the first mixer core; 
 a second LO transformer connected to the FET ring, the second LO transformer configured to furnish a second LO signal occurring in a second limited range of frequencies to the second mixer core, the first limited range of frequencies different than the second limited range of frequencies, 
 a first driver coupled to the first LO transformer, the first driver configured to amplify the first LO signal during a first time interval; and 
 a second driver coupled to the second LO transformer, the second driver configured to amplify the second LO signal during a second time interval, 
 wherein the first LO signal is configured to cause the first mixer core to commutate a frequency mixer signal during the first time interval and the second LO signal is configured to cause the second mixer core to commutate the frequency mixer signal during the second time interval. 
 
     
     
       12. The frequency mixer as recited in  claim 11 , wherein the second mixer core is configured to at least substantially pass-thru the signal during the first time interval and the first mixer core is configured to at least substantially pass-thru the signal during the second time interval. 
     
     
       13. The frequency mixer as recited in  claim 11 , wherein the FET ring includes a plurality of segments, each one of the plurality of segments including at least a first transistor and a second transistor, the first transistor defining the first mixer core and the second transistor defining the second mixer core. 
     
     
       14. The frequency mixer as recited in  claim 13 , wherein at least one of the first transistor or the second transistor comprise a metal-oxide-semiconductor field-effect transistor (MOSFET) device. 
     
     
       15. The frequency mixer as recited in  claim 14 , wherein at least one of the first transistor and the second transistor comprise an n-type MOSFET device. 
     
     
       16. The frequency mixer as recited in  claim 13 , further comprising a first LO path for transmitting the first LO signal during the first time interval; and a second LO path for transmitting the second LO signal during the second time interval, wherein the first transistor is connected to a first LO path and the second transistor is connected to a second LO path. 
     
     
       17. The frequency mixer as recited in  claim 16 , further comprising LO select circuitry for selectively activating the first LO path during the first time interval and selectively activating the second LO path during the second time interval.